Method of power control in a wireless communication system

Abstract

A method of power control in a 3G wireless communication system ( 100 ) incorporating fast forward power control, may include setting an initial base station transmit power boundary ( 402 ) and an initial signal-to-noise ratio boundary ( 502 ). A mobile station ( 102 ) may send a forward link FER measurement to a base station ( 106 ). The base station may perform at least one of a base station transmit power boundary adjustment ( 403 ) and a mobile station signal-to-noise ratio boundary adjustment ( 503 ) based on the forward link FER measurement received from the mobile station, thereby imposing dynamic constraints on the fast forward power control operation.

1. A method of power control in a 3G wireless communication system, comprising:
 a mobile station communicating a forward link Frame Error Rate (FER) measurement to a base station on a reverse link; 
 the base station performing at least one of a base station transmit power boundary adjustment and a mobile station signal-to-noise ratio boundary adjustment based on the forward link FER measurement received from the mobile station, wherein the base station transmit power boundary adjustment comprises: 
 if the forward link FER measurement is above an FER threshold value, and if a base station maximum transmit power setpoint is not at a maximum transmit power ceiling, increasing the base station maximum transmit power setpoint; 
 if the forward link FER measurement is below the FER threshold value and if the base station maximum transmit power setpoint is not at a maximum transmit power floor, decreasing the base station maximum transmit power setpoint; 
 and wherein the mobile station signal-to-noise ratio boundary adjustment comprises: 
 if the forward link FER measurement is above the FER threshold value, and if a maximum signal-to-noise ratio target setpoint is not at a maximum signal-to-noise ratio ceiling, increasing the maximum signal-to-noise ratio target setpoint; and 
 if the forward link FER measurement is below the FER threshold value, and if the maximum signal-to-noise ratio target setpoint is not at a maximum signal-to-noise ratio floor, decreasing the maximum signal-to-noise ratio target setpoint. 
 
     
     
       2. The method of  claim 1 , wherein the base station transmit power boundary adjustment comprises:
 if the forward link FER measurement is above a FER threshold value, and if a base station minimum transmit power setpoint is not at a minimum transmit power ceiling, increasing the base station minimum transmit power setpoint; and 
 if the forward link FER measurement is below the FER threshold value and if the base station minimum transmit power setpoint is not at a minimum transmit power floor, decreasing the base station minimum transmit power setpoint. 
 
     
     
       3. The method of  claim 1 , wherein the mobile station signal-to-noise ratio boundary adjustment comprises:
 if the forward link FER measurement is above the FER threshold value, and if a minimum signal-to-noise ratio target setpoint is not at a minimum signal-to-noise ratio ceiling, increasing the minimum signal-to-noise ratio target setpoint; and 
 if the forward link FER measurement is below the FER threshold value, and if the minimum signal-to-noise ratio target setpoint is not at a minimum signal-to-noise ratio floor, decreasing the minimum signal-to-noise ratio target setpoint. 
 
     
     
       4. The method of  claim 1 , wherein the mobile station communicating the forward link FER measurement to the base station on the reverse link comprises the mobile station communicating the forward link FER measurement to the base station on the reverse link using a PMRM message. 
     
     
       5. The method of  claim 1 , wherein a rate of change of the base station transmit power boundary adjustment is a function of at least one of a soft handoff state and a call service class. 
     
     
       6. The method of  claim 1 , wherein a rate of change of the mobile station signal-to-noise ratio boundary adjustment is a function of at least one of a soft handoff state and a call service class. 
     
     
       7. The method of  claim 1 , wherein at least one of the maximum transmit power ceiling and the maximum transmit power floor is a function of at least one of a soft handoff state and a call service class. 
     
     
       8. The method of  claim 1 , wherein at least one of the maximum signal-to-noise ratio ceiling and the maximum signal-to-noise ratio floor is a function of at least one of a soft handoff state and a call service class. 
     
     
       9. A method of power control in a 3G wireless communication system, comprising:
 setting an initial base station transmit power boundary and an initial signal-to-noise ratio boundary; 
 a mobile station communicating a forward link Frame Error Rate(FER) measurement to a base station on a reverse link; 
 the base station performing at least one of a base station transmit power boundary adjustment and a mobile station signal-to-noise ratio boundary adjustment based on the forward link FER measurement received from the mobile station, wherein the base station transmit power boundary adjustment comprises: 
 adjusting the initial base station transmit power boundary to a second base station transmit power boundary; and 
 wherein the mobile station signal-to-noise ratio boundary adjustment comprises: 
 adjusting the initial signal-to-noise ratio boundary to a second signal-to-noise ratio boundary, and 
 wherein the step of adjusting the initial base station transmit power boundary comprises: 
 if the forward link FER measurement is above an FER threshold value, and if a base station maximum transmit power setpoint is not at a maximum transmit power ceiling, increasing the base station maximum transmit power setpoint; and 
 if the forward link FER measurement is below the FER threshold value and if the base station maximum transmit power setpoint is not at a maximum transmit power floor, decreasing the base station maximum transmit power setpoint. 
 
     
     
       10. The method of  claim 9 , wherein the mobile station communicating the forward link FER measurement to the base station on the reverse link comprises the mobile station communicating the forward link FER measurement to the base station on the reverse link using a PMRM message. 
     
     
       11. The method of  claim 9 , further comprising performing a fast forward link power control procedure within at least one of the second base station transmit power boundary and the second signal-to-noise ratio boundary. 
     
     
       12. The method of  claim 9 , wherein a rate of change from the initial base station transmit power boundary to the second base station transmit power boundary is a function of at least one of a soft handoff state and a call service class. 
     
     
       13. The method of  claim 9 , wherein a rate of change from the initial signal-to-noise ratio boundary to the second signal-to-noise ratio boundary is a function of at least one of a soft handoff state and a call service class. 
     
     
       14. A method of power control in a 3G wireless communication system, comprising:
 setting an initial base station transmit power boundary and an initial signal-to-noise ratio boundary; 
 a mobile station communicating a forward link Frame Error Rate (FER) measurement to a base station on a reverse link; 
 the base station performing at least one of a base station transmit power boundary adjustment and a mobile station signal-to-noise ratio boundary adjustment based on the forward link FER measurement received from the mobile station, wherein the base station transmit power boundary adjustment comprises: 
 adjusting the initial base station transmit power boundary to a second base station transmit power boundary; and 
 wherein the mobile station signal-to-noise ratio boundary adjustment comprises: 
 adjusting the initial signal-to-noise ratio boundary to a second signal-to-noise ratio boundary wherein the step of adjusting the initial signal-to-noise ratio boundary comprises: 
 if the forward link FER measurement is above an FER threshold value, and if a maximum signal-to-noise ratio target setpoint is not at a maximum signal-to-noise ratio ceiling, increasing the maximum signal-to-noise ratio target setpoint; and 
 if the forward link FER measurement is below the FER threshold value, and if the maximum signal-to-noise ratio target setpoint is not at a maximum signal-to-noise ratio floor, decreasing the maximum signal-to-noise ratio target setpoint. 
 
     
     
       15. A computer-readable medium containing computer instructions for instructing a processor to perform a method of power control in a 3G wireless communication system, comprising:
 setting an initial base station transmit power boundary and an initial signal-to-noise ratio boundary; 
 a mobile station communicating a forward link Frame Error Rate (FER) measurement to a base station on a reverse link; 
 the base station performing at least one of a base station transmit power boundary adjustment and a mobile station signal-to-noise ratio boundary adjustment based on the forward link FER measurement received from the mobile station, wherein the base station transmit power boundary adjustment comprises: 
 adjusting the initial base station transmit power boundary to a second base station transmit power boundary; and 
 wherein the mobile station signal-to-noise ratio boundary adjustment comprises: 
 adjusting the initial signal-to-noise ratio boundary to a second signal-to-noise ratio boundary wherein adjusting the initial signal-to-noise ratio boundary comprises: 
 if the forward link FER measurement is above an FER threshold value, and if a maximum signal-to-noise ratio target setpoint is not at a maximum signal-to-noise ratio ceiling, increasing the maximum signal-to-noise ratio target setpoint; and 
 if the forward link FER measurement is below the FER threshold value, and if the maximum signal-to-noise ratio target setpoint is not at a maximum signal-to-noise ratio floor, decreasing the maximum signal-to-noise ratio target setpoint. 
 
     
     
       16. The computer-readable medium of  claim 15 , wherein a rate of change from the initial base station transmit power boundary to the second base station transmit power boundary is a function of at least one of a soft handoff state and a call service class. 
     
     
       17. The computer-readable medium of  claim 15 , wherein a rate of change from the initial signal-to-noise ratio boundary to the second signal-to-noise ratio boundary is a function of at least one of a soft handoff state and a call service class. 
     
     
       18. A computer-readable medium containing computer instructions for instructing a processor to perform a method of power control in a 3G wireless communication system, comprising:
 setting an initial base station transmit power boundary and an initial signal-to-noise ratio boundary; 
 a mobile station communicating a forward link Frame Error Rate (FER) measurement to a base station on a reverse link; 
 the base station performing at least one of a base station transmit power boundary adjustment and a mobile station signal-to-noise ratio boundary adjustment based on the forward link FER measurement received from the mobile station, wherein the base station transmit power boundary adjustment comprises: 
 adjusting the initial base station transmit power boundary to a second base station transmit power boundary wherein adjusting the initial base station transmit power boundary comprises: 
 if the forward link FER measurement is above an FER threshold value, and if a base station maximum transmit power setpoint is not at a maximum transmit power ceiling, increasing the base station maximum transmit power setpoint; and 
 if the forward link FER measurement is below the FER threshold value and if the base station maximum transmit power setpoint is not at a maximum transmit power floor, decreasing the base station maximum transmit power setpoint, and 
 wherein the mobile station signal-to-noise ratio boundary adjustment comprises: 
 adjusting the initial signal-to-noise ratio boundary to a second signal-to-noise ratio boundary.